/* Admin page styles — extracted from admin.html */
* { box-sizing: border-box; }

.admin-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px 60px;
}

/* --- Navigation --- */
.admin-nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}
.admin-nav a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 10px;
    background: #f0f2f5;
    color: #2c3e50;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.92rem;
    transition: background .15s, color .15s;
}
.admin-nav a:hover { background: #e0e4ea; }

/* --- Header --- */
.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 28px;
}
.admin-header h1 {
    font-size: 1.6rem;
    font-weight: 800;
    color: #2c3e50;
    margin: 0;
}

/* --- Card / Section --- */
.card {
    background: #fff;
    border-radius: 16px;
    padding: 24px 28px;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #2c3e50;
    margin: 0 0 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f0f2f5;
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-subtitle {
    font-size: 1rem;
    font-weight: 700;
    color: #34495e;
    margin: 20px 0 10px;
}
.card-hint {
    padding: 12px 16px;
    background: #eef6fd;
    border-radius: 10px;
    color: #2c3e50;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 16px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background .15s, transform .1s, box-shadow .15s;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: #fff;
    box-shadow: 0 2px 8px rgba(37,99,235,0.25);
}
.btn-primary:hover { background: linear-gradient(135deg, #2563eb, #1d4ed8); }
.btn-danger {
    background: #fee2e2;
    color: #dc2626;
}
.btn-danger:hover { background: #fecaca; }
.btn-ghost {
    background: #f0f2f5;
    color: #64748b;
}
.btn-ghost:hover { background: #e2e5ea; }
.btn-sm { padding: 6px 12px; font-size: 0.82rem; border-radius: 8px; }
.btn-edit {
    background: #dbeafe;
    color: #2563eb;
}
.btn-edit:hover { background: #bfdbfe; }
.btn-delete {
    background: #fee2e2;
    color: #dc2626;
}
.btn-delete:hover { background: #fecaca; }

/* --- Tabs --- */
.tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 14px;
}
.tab-btn {
    padding: 8px 18px;
    border-radius: 10px;
    border: 1px solid #e2e5ea;
    background: #f8f9fa;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    color: #64748b;
    transition: all .15s;
}
.tab-btn.active {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(37,99,235,0.2);
}
.tab-panel { display: none; padding: 14px 16px; background: #f8f9fb; border-radius: 12px; }
.tab-panel.visible { display: block; }

/* --- Forms --- */
.form-row { margin-bottom: 14px; }
.form-row label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    font-size: 0.88rem;
    color: #475569;
}
.form-row input[type="text"],
.form-row input[type="email"],
.form-row input[type="password"],
.form-row input[type="number"],
.form-row textarea,
.form-row select {
    width: 100%;
    max-width: 440px;
    padding: 10px 14px;
    border: 1.5px solid #d1d5db;
    border-radius: 10px;
    font-family: inherit;
    font-size: 0.95rem;
    color: #1e293b;
    background: #fff;
    transition: border-color .15s, box-shadow .15s;
}
.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}
.form-row textarea { min-height: 130px; resize: vertical; }
.form-row .input-narrow { max-width: 140px; }
.form-row .input-hint {
    display: inline-block;
    font-size: 0.82rem;
    color: #94a3b8;
    margin-left: 8px;
}
.form-inline-radios {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.form-inline-radios label,
.form-checkbox label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    color: #475569;
    cursor: pointer;
}
.form-checkbox { margin-bottom: 14px; }
.form-error {
    display: none;
    margin-top: 8px;
    padding: 10px 14px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 10px;
    color: #dc2626;
    font-size: 0.88rem;
    font-weight: 500;
}

/* --- Item lists (children, lessons) --- */
.item-list { list-style: none; padding: 0; margin: 0 0 14px; }
.item-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 14px;
    background: #f8f9fb;
    border-radius: 10px;
    margin-bottom: 6px;
    transition: background .12s;
}
.item-list li:hover { background: #f0f2f5; }
.item-list li .item-name { font-weight: 600; color: #334155; }

/* --- Collapsible groups --- */
.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-radius: 12px;
    background: #f4f7fb;
    cursor: pointer;
    margin-bottom: 6px;
    user-select: none;
    transition: background .12s;
}
.group-header:hover { background: #e8edf4; }
.group-header .group-label {
    font-weight: 700;
    font-size: 0.95rem;
    color: #334155;
}
.group-header .group-count {
    font-size: 0.8rem;
    font-weight: 600;
    color: #94a3b8;
    background: #e2e8f0;
    padding: 2px 8px;
    border-radius: 999px;
}
.group-header .group-chevron {
    font-size: 0.75rem;
    color: #94a3b8;
    transition: transform .2s;
    margin-left: 8px;
}
.group-header.open .group-chevron { transform: rotate(90deg); }
.group-body {
    display: none;
    padding-left: 14px;
    margin-bottom: 8px;
}
.group-body.open { display: block; }

.subgroup-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 10px;
    background: #fafbfc;
    border: 1px solid #e9ecef;
    cursor: pointer;
    margin-bottom: 4px;
    user-select: none;
    transition: background .12s;
}
.subgroup-header:hover { background: #f0f2f5; }
.subgroup-header .group-label { font-weight: 600; font-size: 0.9rem; color: #475569; }
.subgroup-header .group-chevron { font-size: 0.7rem; color: #94a3b8; transition: transform .2s; }
.subgroup-header.open .group-chevron { transform: rotate(90deg); }
.subgroup-body {
    display: none;
    padding-left: 10px;
    margin-bottom: 6px;
}
.subgroup-body.open { display: block; }

/* --- Lesson items inside groups --- */
.lesson-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 14px;
    background: #fff;
    border: 1px solid #f0f2f5;
    border-radius: 10px;
    margin-bottom: 5px;
    cursor: grab;
    transition: border-color .12s, box-shadow .12s, transform .12s, background .12s;
}
.lesson-item:hover {
    border-color: #dbeafe;
    box-shadow: 0 2px 8px rgba(59,130,246,0.06);
    background: #f9fbff;
}
.lesson-item.dragging {
    opacity: 0.6;
    border-color: #3b82f6;
    transform: scale(0.98);
}
.lesson-item .lesson-title { font-weight: 600; font-size: 0.92rem; color: #1e293b; }
.lesson-item .lesson-meta { font-size: 0.8rem; color: #94a3b8; margin-top: 2px; }
.lesson-actions { display: flex; gap: 6px; flex-shrink: 0; }

/* --- Queue drag list --- */
.queue-list { list-style: none; padding: 0; margin: 0; }
.queue-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 14px;
    background: #fff;
    border: 1.5px dashed #d1d5db;
    border-radius: 10px;
    margin-bottom: 5px;
    cursor: grab;
    transition: border-color .15s, background .15s;
}
.queue-list li:hover { border-color: #93c5fd; background: #f0f7ff; }
.queue-list li.dragging { opacity: 0.5; border-color: #3b82f6; }
.queue-list li .lesson-title { font-weight: 600; font-size: 0.9rem; color: #1e293b; }
.queue-list li .lesson-meta { font-size: 0.8rem; color: #94a3b8; margin-top: 2px; }

/* --- Modal --- */
.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.45);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.modal-backdrop.visible { display: flex; }
.modal-content {
    background: #fff;
    border-radius: 18px;
    padding: 28px 28px 20px;
    max-width: 540px;
    width: 92%;
    max-height: 92vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.18);
}
.modal-content h3 {
    margin: 0 0 18px;
    font-size: 1.15rem;
    font-weight: 700;
    color: #1e293b;
}
.modal-footer { margin-top: 18px; display: flex; gap: 10px; }
.modal-content.modal-wide { max-width: 720px; max-height: 92vh; overflow-y: auto; }
/* Модалка чтения на весь экран */
#progress-lesson-detail-modal.modal-reading .modal-content {
    width: 99vw;
    max-width: 99vw;
    height: 98vh;
    max-height: 98vh;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
#progress-lesson-detail-modal.modal-reading .modal-content .lesson-view {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}
.progress-reading-layout {
    margin-top: 0;
    margin-bottom: 0;
    display: flex;
    gap: 0;
    align-items: stretch;
    min-width: 0;
    height: fit-content;
    align-self: flex-start;
}
.progress-reading-box {
    padding: 12px;
}
/* Левое: 50% по умолчанию, ресайз за угол; среднее и правое делят остаток, та же высота */
.progress-reading-left {
    flex: 0 0 auto;
    width: 50%;
    min-width: 280px;
    max-width: 75%;
    resize: both;
    overflow: auto;
    min-height: 200px;
    height: 320px;
    display: flex;
    flex-direction: column;
}
.progress-reading-mid,
.progress-reading-right {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    /* фиксируем высоту как у левого блока, чтобы включался внутренний скролл */
    height: 320px;
    min-height: 200px;
    overflow: hidden;
}
@media (max-width: 900px) {
    .progress-reading-layout { flex-wrap: wrap; }
    .progress-reading-left { flex: 1 1 100%; height: 280px; }
    .progress-reading-mid, .progress-reading-right { flex: 1 1 calc(50% - 6px); height: 280px; }
}
@media (max-width: 600px) {
    .progress-reading-mid, .progress-reading-right { flex: 1 1 100%; }
}
.progress-reading-left .highlight-box {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    box-sizing: border-box;
}
.progress-reading-mid .result-box,
.progress-reading-right .result-box {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    box-sizing: border-box;
}
.progress-detail-block { margin-bottom: 18px; }
.progress-detail-loading { padding: 20px; text-align: center; color: #64748b; }
/* Стиль «как у ребёнка» внутри модалки */
#progress-lesson-detail-modal .lesson-view .math-card {
    background: #fff;
    border-radius: 18px;
    padding: 22px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
    margin-bottom: 18px;
}
#progress-lesson-detail-modal .lesson-view .math-card h1 {
    margin: 0 0 8px;
    font-size: 1.35rem;
    font-weight: 800;
    color: #0f172a;
}
#progress-lesson-detail-modal .lesson-view .math-card .lesson-meta {
    margin-bottom: 0;
    color: #55606d;
    font-size: 0.95rem;
}
#progress-lesson-detail-modal .lesson-view .lesson-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 10px;
}
#progress-lesson-detail-modal .lesson-view .lesson-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    background: #eef6ff;
    color: #2563eb;
    font-weight: 700;
    font-size: 0.92rem;
}
#progress-lesson-detail-modal .lesson-view .question-block {
    border: 1px solid #e8edf3;
    border-radius: 16px;
    padding: 18px;
    margin-top: 16px;
}
#progress-lesson-detail-modal .lesson-view .question-block:first-child { margin-top: 0; }
#progress-lesson-detail-modal .lesson-view .question-title {
    font-weight: 700;
    margin-bottom: 10px;
    font-size: 1.05rem;
}
#progress-lesson-detail-modal .lesson-view .question-help { color: #6b7280; margin-bottom: 12px; }
#progress-lesson-detail-modal .lesson-view .options-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.95rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e2e8f0;
}
#progress-lesson-detail-modal .lesson-view .options-table th,
#progress-lesson-detail-modal .lesson-view .options-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}
#progress-lesson-detail-modal .lesson-view .options-table th {
    background: #f1f5f9;
    font-weight: 700;
    color: #475569;
}
#progress-lesson-detail-modal .lesson-view .options-table th.col-correct,
#progress-lesson-detail-modal .lesson-view .options-table th.col-answer {
    text-align: center;
    width: 120px;
}
#progress-lesson-detail-modal .lesson-view .options-table td.col-correct,
#progress-lesson-detail-modal .lesson-view .options-table td.col-answer {
    text-align: center;
    font-size: 1.2em;
}
#progress-lesson-detail-modal .lesson-view .options-table td.col-correct .mark-v { color: #16a34a; }
#progress-lesson-detail-modal .lesson-view .options-table td.col-answer .mark-v { color: #16a34a; }
#progress-lesson-detail-modal .lesson-view .options-table td.col-answer .mark-x { color: #dc2626; }
#progress-lesson-detail-modal .lesson-view .options-table tbody tr:last-child td { border-bottom: none; }
#progress-lesson-detail-modal .lesson-view .options-table tbody tr:hover { background: #f8fafc; }
#progress-lesson-detail-modal .lesson-view .answer-row .answer-icon { margin-right: 6px; font-size: 1.1em; }
#progress-lesson-detail-modal .lesson-view .answer-row.answer-correct .answer-icon { color: #16a34a; }
#progress-lesson-detail-modal .lesson-view .answer-row.answer-wrong .answer-icon { color: #dc2626; }
#progress-lesson-detail-modal .lesson-view .answer-row {
    margin-top: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 0.92rem;
}
#progress-lesson-detail-modal .lesson-view .answer-row.child-answer { background: #f0f9ff; border: 1px solid #bae6fd; }
#progress-lesson-detail-modal .lesson-view .answer-row.correct-answer { background: #f0fdf4; border: 1px solid #bbf7d0; }
#progress-lesson-detail-modal .lesson-view .answer-row strong { margin-right: 6px; }
#progress-lesson-detail-modal .lesson-view .task-text {
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
}
#progress-lesson-detail-modal .lesson-view .answer-display {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid #d7dee7;
    background: #f9fbfd;
    font-size: 0.95rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 200px;
    overflow-y: auto;
    box-sizing: border-box;
}
#progress-lesson-detail-modal .lesson-view .report-box {
    margin-top: 0;
    padding: 18px;
    border-radius: 16px;
    background: #f8fbff;
    border: 1px solid #dfefff;
}
#progress-lesson-detail-modal .lesson-view .report-box h3 { margin-top: 0; }
#progress-lesson-detail-modal .lesson-view .report-content {
    min-height: 60px;
    max-height: 400px;
    overflow-y: auto;
    padding: 20px;
    background: #fafcff;
    border: 1px solid #d0e3f7;
    border-radius: 8px;
    line-height: 1.7;
    font-size: 1.05em;
}
#progress-lesson-detail-modal .lesson-view .report-content h3 {
    color: #2c3e50;
    margin: 18px 0 8px;
    border-bottom: 2px solid #eee;
    padding-bottom: 4px;
}
#progress-lesson-detail-modal .lesson-view .report-content h3:first-child { margin-top: 0; }
#progress-lesson-detail-modal .lesson-view .text-block {
    padding: 14px 0;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 1rem;
}
.progress-table tbody tr.progress-row-clickable { cursor: pointer; }
.progress-table tbody tr.progress-row-clickable:hover { background: #f1f5f9; }

/* --- Access denied --- */
.access-denied {
    text-align: center;
    padding: 60px 20px;
    color: #94a3b8;
    font-size: 1.1rem;
}
.access-denied a { color: #3b82f6; }

/* --- Empty state --- */
.empty-msg {
    display: none;
    padding: 14px;
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
}

/* --- Responsive --- */
@media (max-width: 600px) {
    .admin-container { padding: 16px 12px 40px; }
    .card { padding: 18px 16px; }
    .form-row input, .form-row textarea, .form-row select { max-width: 100%; }
    .lesson-item, .queue-list li { flex-direction: column; align-items: flex-start; }
    .lesson-actions { align-self: flex-end; }
}

/* --- Progress --- */
#progress-lessons {
    overflow-x: auto;
    max-width: 100%;
}
.progress-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 10px;
    margin-top: 10px;
}
.progress-card {
    background: #f8f9fb;
    border: 1px solid #e6edf5;
    border-radius: 14px;
    padding: 12px 14px;
}
.progress-card .label {
    color: #64748b;
    font-size: 0.86rem;
    font-weight: 700;
}
.progress-card .value {
    margin-top: 6px;
    font-weight: 800;
    font-size: 1.05rem;
    color: #0f172a;
}
.progress-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e6edf5;
}
.progress-table th,
.progress-table td {
    padding: 10px 12px;
    border-bottom: 1px solid #eef2f6;
    text-align: left;
    font-size: 0.92rem;
    vertical-align: top;
}
.progress-table th {
    background: #f8f9fb;
    color: #475569;
    font-weight: 800;
}
.progress-table .filter-row th {
    padding: 6px 8px;
    vertical-align: middle;
}
.progress-table .filter-wrap {
    display: flex;
    gap: 4px;
    align-items: center;
}
.progress-table .filter-wrap .filter-input {
    flex: 1;
    min-width: 0;
}
.progress-table .filter-wrap .filter-pick {
    flex-shrink: 0;
    width: 28px;
    padding: 4px 2px;
    cursor: pointer;
}
.progress-table .filter-row input,
.progress-table .filter-row select {
    max-width: 140px;
    padding: 6px 8px;
    border: 1px solid #e2e5ea;
    border-radius: 6px;
    font-size: 0.82rem;
}
.progress-table .filter-row input {
    width: 100%;
}
.progress-table .filter-row input:focus,
.progress-table .filter-row select:focus {
    outline: none;
    border-color: #3b82f6;
}
.status-failed {
    color: #dc2626;
    font-weight: 700;
}
.status-paused-icon {
    color: #ca8a04;
}
.retake-reset-link {
    cursor: pointer;
    text-decoration: underline;
    text-decoration-style: dotted;
    color: #2563eb;
}
.retake-reset-link:hover {
    color: #1d4ed8;
    text-decoration-style: solid;
}
.pill-small {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 9px;
    border-radius: 999px;
    background: #f0f2f5;
    font-size: 0.82rem;
    font-weight: 700;
    color: #475569;
    white-space: nowrap;
}
.pill-small.danger { background: #fee2e2; color: #dc2626; }

/* --- Math lesson builder --- */
.builder-wrap {
    margin-top: 10px;
    padding: 14px;
    border: 1px solid #e6edf5;
    background: #f8f9fb;
    border-radius: 14px;
}
.builder-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    margin-bottom: 10px;
}
.builder-row .row2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}
.builder-q {
    background: #fff;
    border: 1px solid #e6edf5;
    border-radius: 14px;
    padding: 12px;
    margin-top: 10px;
}
.builder-q-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}
.builder-q-title {
    font-weight: 800;
    color: #334155;
}
.builder-options {
    display: grid;
    gap: 8px;
    margin-top: 8px;
}
.builder-option {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
    align-items: center;
}
.builder-option input[type="text"] {
    width: 100%;
}
.builder-inline {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}